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E39 (1997 - 2003) The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

I am searching for a solution but yet to find but I am getting close.....did you know that a 540i 09/98 to 12/98 has vanos on them....i sure didn't ...but its not like the kind mounted on the outside of the valve cover...this baby is internal of the valve cover.....i will be posting a diy of what i find in a few.....btw.....i was getting engine knock like a diesel and i researched the vanos problem on youtube and found i had the same sound.....but mine is totally different and harder to replace....wish me luck...11/98 540i